The essence of the base MBP 13" vs 2020 i5 Air Comparisons are as follows:
MBA i5 - Has faster SSD write (read is the same on both), Faster Single Core performance, Better Keyboard. Better Speakers, Better Microphone, 3x faster graphics performance but not for sustained loads like gaming, 2 hrs more battery life.
MBP Base (128GB) - Has Better Screen, Faster Multicore, Better Thermal Management, Does not throttle on sustained CPU loads. Faster sustained graphics performance.
Basically if your usage doesn't involve workloads that have sustained CPU/GPU loads like video editing then the MBA is the far better option.